Math problem: Xiaoming borrowed 500 yuan from his father and 500 yuan from his mother. 1* *1000 yuan was used to buy leather shoes, and 970 yuan was used. The rest of 30 yuan was returned to his father, who still owed 500- 10 = 490 yuan, and he also paid 10 yuan to his mother, 500-6500. 490+490=980 yuan still owes his parents ***980 yuan. 980 plus the remaining 10 yuan, 980+ 10=990 yuan. Excuse me,1where did 0 yuan go?

Borrowed 500 yuan from my father+500 yuan from my mother = 1000 yuan in total.

970 yuan used it to buy leather shoes, and 30 yuan was left. I gave 10 yuan back to my father and 10 yuan back to my mother.

That is, I borrowed my dad 490 yuan+my mom 490 yuan = I always borrowed 980 yuan. (The point is that the total amount of money borrowed by * * * is 980 yuan, not the previous 1 ,000 yuan).

So where did this 980 yuan go?

I bought leather shoes with 970 yuan+my remaining 10.